The United Nations Educational, Scientific, and Cultural Organization (UNESCO) has added six historical locations in Syria to its list of endangered World Heritage sites, warning that more than two years of civil war has inflicted heavy damage.

The decision by UNESCO came at its annual meeting on June 20 in Phnom Penh, Cambodia.

The endangered sites include the ancient cities of Damascus, Bosra, and Aleppo, the oasis of Palmyra, and the castles of Crac des Chevaliers and Qal’at Salah El-Din, which count as one site.

Also included as one site were the ancient villages in northern Syria.

UNESCO spokesman Roni Amelan says the decision was meant to rally support for the protection of the sites.